Combined type-writing and computing machine.



F. WALSLEBENK COMBINED TYPE WRTING AND COMPUTING MACHINE.

APPLICATION FILED NOV 2!, 19H. 1,255,828. Patented Feb. 5,1918.

2 SHEETS-SHEEN l.

F. WALSLEBEN.

COMBINED TYPE WRlTiNG AND COMPUTING MACHINE.

APPLICATION HLED NOV.2l, 1913.

seen 2.

Patented Feb. 5

2 SHEETS .fltlvf UNITED STATES: PATENT OFFICE.

FRED WALSLEBEN, OF NEW YORK, N. Y.,

ASSIGNOR, BY MESNE ASSIGNMENTS, T0

UNDERWOOD COMPUTING MACHINE COMPANY, OF NEW YORK, N. Y., A CORPO- RATION OF NEW YORK.

COMBINED TYPE-WRITING- AND COMPUTING MACHINE.

Specification of Letters Patent.

Application filed November 21, 1913. Serial No. 802,203.

My invention relates to recording com-.

puting machines, especially those of the type in which a number is temporarily set up or registered, and from such register is later carried into a totalizer; provision being made for permitting the number, when temporarily registered, to be canceled from such register instead of being carried into the totalizer.

A feature of my invention is the provision of mechanism by which a number printed by the keys and temporarily set up, may be characterized when the error has been made and the set-up canceled, such characterization being preferably effective before another set-up.

Another feature of my invention relates to the particular manner of, rendering the characterization effective before another setup is made, and consists in the provision of means which compel the operative, when canceling a number, to print some kind of sign on the record. This sign indicates on I the work-sheet that the number, although.

written on the work-sheet, was not run into the machine, andis therefore to be disregarded. Hence in canceling and then resetting a number, a second mistake is not likely to creep into the work.

The means for thus canceling a number from a register is commonly called an er-' ror key, and according to my invention, a printing device may be so connected, that operation of an error key will insure the rinting of some signal such as the letter I on the printed record, before any further work isdone on the computing machine.

My invention is herein shown as applied to a combined typewriting and computing machine of the Underwood-Hanson type, in which the numbers written by the typewriter are temporarilyregistered on computation members or bars, and after a number has been completely thus registered, a

general operator is actuated to carry the numbers thus registered into a totalizer. The computation members in said Underwood-Hanson machine include index-pins settable to effective positions on said bars, which pins normally occupy an ineffective position, but when in effectiveposition serve to temporarily register the numbers printed.

Each bar is provided for this purpose with an index-pin for every digit, and when a typewriter numeral key is actuated, the

index-pin corresponding to the digit Written by said numeral key is Set to effective position on whichever index-pin bar cor-,

responds to the column in which the number is being written.

The Underwood-Hanson machine is pro vided with a canceling orpin-restoring plate underlying all the index-pins on the pin bars, and said plate may be raised by means of an error bar or key, thus restoring to normal ineffective position any pins which have been depressed, viz., set to ef- .fective position.

The actuation of the error key to thus re-' move the index-pins from their effective to their ineffective positions, may automatically set devices to interfere with the use of the mechanism, but sald mechanism may be released bythe action of a typewriter key to print the desired sign on the printed rec- I provide that the E key of the typewriter shall thus release the computing mechanism.

Said Underwood-Hanson machine is provided with a guard bar which. may be swung automatically over the numeral keys and interfere with any attempted operatlon of them, when it would be improper to opcrate them. According to my invention, this guard bar may be moved to its effective position by the operation of the error key. Thus the fact that the guard bar is in its effective position, is a warning to the op- 'erative that it is improper to attempt to Patented Feb. 5, 1918.

erator may be elicctive to automatically at tain the. same result in my invention, but the connections may be such that the general operator is ineffective to restore the guard bar or shutter to inedective position unless the E key of the t pewriter is first depressed.

Other features and matter appear.

In the accompanying drawings,

Figure 1 a sectional side view otan l'nderwood-Hanson combined typewriting and computing machine, showing so much of the parts thereof as is convenient for th illustration of my invention.

Fig. 2 is enlarged side view of the connections between the general operator, the error key and the E type key.

Fig. 3 is a side view of a device for making the error key effective on the pin-restoring plate.

Fig. l is a plan view of part of Fig. 3.

Fig. 5 is a skeleton perspective showing the error key, and most of the parts connected thereto, according to my invention.

Fig. 6 is an enlarged view of part of l i 5 advantages will herethe Underwood-Hanson combined lypewriting and computing machine, the usual. numeral keys 1 and alphabet kevs '2 depress key levc s to swing type bars by mean of elbow lei rs 5 upwardly and rearwai against a platen 6, so that lower case types 7 and upper case types 8 on said bars print against a work-sheet passed around said platen.

Said platen forms part of a carriage 9 rich is normally drawn along in letteri'eeding direction by a spring barrel not shown herein. Said carriage is fed along stey-by-step in said letter-feeding at every actuation of the numeral and alphabet keys 1 2.

For this purpose, each type bar l is provided with a heel 11' which as the type i" and 8- approaches the platen 6, strikes a bar 11 forming part of a universal member 12, said universal member connected to letteri eeding dogs 13 and 1-3, which dogs alternately eng; ge the usual escapement wheel 15. Said escapement wheel controls the feeding of the carriage. by the usual pinion 1(3 meshing wit-i the usual rack 17, which rack is connected to said carriage.

As said carriage travels along, it moves aeriaiim to effective position computation members 18 so that the numeral keys when operated, will ,setupon each member a pin 19, thus registering the digit printed, on the computation member 18 which corresponds to the column in which said digit is printed the meme The conn tion member. 0 eti'ective osition, include a denomination tappet or cog 20 which is is for moving the computamounted on a bracket 21 fas to the type writer carriage. Said dog, as the carriage travels along, raises the front ends of jacks which are pivoted on a rod 23, thus depressing the rear ends 21 of said jacks, and thereby depressing links 25, which are connected to the computation members 18 to move said computation members to effective position.

Each of the links at its lower end rests in a pivoted lever 26, the opposite end 27 of said lever being connected by the usual transposition device 28 to the computation inenil 18, so that whenever a jack 22 is raised by the dog 20, the link when depressed, will raise said computation member so as to bring the pins 19 thereon within the range of action of pin-setting linkages 30, whereby the pins are set. These pinsetting linkages are operated by the numeral keys of the typewriter, which keys for this purpose are provided with pendents 31, said pendents extending from the numeral keys down to rock arms 32, which arms are mounted on rock shafts 33, each rock shaft being connected to its pin-setting linkage by the usual arm 31, and other connections not shown herein.

' The connections are such that whenever a number key is depressed, its pendent 31 in descending with the key, swings down its pin-setting linkage 30, so as to depress (that is, set.) the corresponding pin on the computation member 18 which at the moment is in ofi'ective or raised position.

lVhen a number has been completely registered by setting up pins corresponding to its digits on the computation members 18, said number is carried into computing wheels 35, which wheels form a totalizer for adding all the numbers which are set up one after another on the computation members 18. To accomplish this, there is provided the usual Underwood-Hanson general operator including a cross bar 36, which cross bar, as it comes forward, strikes the lower ends of any depressed pins 19, and carries the computation members 18 forwardly. to an extent determined by the pins depressed thereon in the manner described in the patent to Hanson,'81(l,319, dated 'Mareh 27. 1906, As the computation members 18 move forward, racks 37 forming the forward rods of said members, turn the computing wheels' 85 by pinions 38 thereon each to an extent determined by the distance the computation member 18 and its rack 37 are driven by its set pin; said computation members being idle on their return stroke, owing to pawland-ratchet connections between the computing wheels and their pinious 38.

The computation members are returned to their normal positions by the usual cross bar 39, which also forms part of said general operator, and engages lugs 40 on said tarily to restore all the set pins on the com putation members 18, thus leaving the device ready to set up a new number. The

general operator also includes side bars comprising racks 42 by which it is driven through an idle pinion 43 meshing with the usual driving segment 44.

Means are provided for interfering with the operation of the numeral keys after the last digit of a number is written, and a shutter is also provided which after the writing of the last digit of a number is moved to hide the computing wheels so that the operative will be unable to attempt to copy off a number on said wheels which has been set up on the computation members but not yet carried into said wheels. Said numeral key interfering means and the shutter are moved to their normal ineffective positions by the actuation of a general operator.

For automatically moving the shutter to effective position, the machine includes a special jack identical with the jacks 22, except that it is only raised momentarily by the dog 20, said jack being located so as to be operated in the letter-space movement caused by the writing of a digit in the units column. Said special jack operates a link 45 similar to the links 25, but usually not extending so far down, andsaid link, through a rock arm 46, when depressed, swings a latclrreleasing rock shaft 47 so as to draw back alatch 48 to ineffective position, thereby releasing the shutter 49 so that said shutter may be drawn by a spring 50 operatively connected thereto, over the sight window 51, through which window the numerals are read off the computing wheels 35.

The connections between the spring 50 and the shutter '49 include a bell crank 52 which said spring normally draws in such a manner as to swing the. forward arm 53 thereof upwardly, thus forcing upward a rock arm 54 to which said bell crank arm 53 is connected by a pin-and-slot connection, said rock arm 54 being fast to a rock shaft 55 shown most clearly in Fig. 5, which rock shaft carries a second rock arm 56 connected by a link 57 to the shutter.

The connections are such that when the spring 50 is free to draw on the bell crank 52, it pulls the link 57 rearwardly, thus swinging the shutter 49 upwardly and rear wardly around its pivots 58 to the position seen in Fig. 2.

The shutter-controlling rock arm 54 is usually latched down by the latch 48, which latch, as above described, is moved to ineffective position by the special link 45, said latch being normally held in effective position by a spring .59, which pulls the latch 48 forward, so that the point 60 thereof rests in a notch 61 in the shuttercontrolling rock arm 54. The latch 48 is guided by a pin 62 which rides in a slot 63 on said latch.

Whenever the shutter 49 is moved, it moves the guard bar 64, the arrangement being such. that whenever the shutter covers the sight window 51, it holds the guard bar 64 over the numeral keys 1, thus interfering with the "operation of them. l/Vhen, however, the shutter is clear of the window 51, the guard bar 64 is kept in ineffective position to the rear of the numeral keys, as seen in Fig. 1. To bring this about, said guard bar 64 is mounted on arms 65 fast on the rock shaft 55, which shaft is linked to the shutter 49 by the link 57.

Whenever a number has been set or registered by the operation of the. numeral keys on the computation members 18 in depressing the pins 19, said member may be erased from said register by actuating an error bar 66 terminating at the front of the machine in the usual error key 67. This result is brought about by causing said error key, when actuated, to raise the pin-restoring plate 41 to the position seen in Fig. 8, where it has risen against the under side of the computation member 18, thus forcing any depressed pins up to their normal ineffective position. To bring this about, the plate 41 is mounted as usual on linked bell cranks 68 about which bell cranks it may be swung upward by a rock arm 69, said rock arm having fast thereto a bell crank arm 70 which is moved by the error key bar 66 in a manner now to be described.

Whenever the error key is pushed rearwardly, it tensions a spring 71 which is fast to a post 72 on the error key bar, so that said spring 71 tends to draw rearwardly the bell crank arm 70 to which it is attached. Said bell crank arm, however, is prevented from being thus drawn rearwardly by said spring, because of a detaining arm 73 which is normally held by a spring 74 against a stud 75 on said bell crank arm. When the error key has, however, been pushed back nearly to the limit of its throw, the detaining arm 7 3 is swung to ineffective position clear of the stud 75, thus permitting the spring 71 to snap the pin-restoring plate 41 upward to effective position.

The means for thus swinging the detaining arm 73 to ineffective position include a stud 76 which, as the error key moves rearwardly, strikes against a bell crank releasing arm 77 fast to the detaining arm 73, thus swinging said detaining arm clear of the stud 75. Said stud 75 may include a roller 78 to render the operation of the detaining arm more easy.

The post 72 to which the spring 71 is anchored, is extended through the error key bar 66 and rides in a slot 79 in a bracket 80, to serve as a support for the rear end of the error key bar.

The spring 71 is prevented from throwing the pin-restoring plate 11 too violently by a bar 81. about which said spring 71 is coiled, said bar being connected to the post 82, by which post the spring 71 is attached to the bell crank arm 70. The bar 81 is of such length, that it allows the spring 71 to contract only sufficiently to raise the pinrestoring plate $1 to just the right height, and then arrests it, because the end of said bar strikes the post 72 on the error key bar 66.

\Vhenever the error key (57 is thus actuated, it automatically moves the shutter 49 to close the window 51. and moves the guard bar (54V to effective position, thus warning the operative that the computing mechanism is not in proper shape for work. To accomplishthis, the error key is provided with means for releasing the latch 48. For this purpose said latch 48 is provided with a lug 83 by which a releasing bar 81 moves said latch to ineffective position at the operation of the error key.

To thus move the latch to ineffective position, said releasing bar 81 includes a lug 85 by which it engages the lug 83 on the latch, and said releasing bar is slidable along a fixed bracket 86, being guided thereon by a pin 87 which rides in a slot 88 on the releasing bar. The front end of said re leasing bar is provided with an upright cam lug S8, and through this lug the releasing bar 84 is moved at the actuation of an error key, by means of roller tappet 89 which rides up along the cam surface of said lug whenever the error key is actuated.

The connections between the error key and the tappet 89 include a slotted link 90 riding on a pin 91 on the error key bar 66, said link being attached at its other end to a rock arm 92 fast on a rock shaft 93, which rock shaft operates the tappet 89 by a link 94. This link 91 is at its front end attached to a rock arm 95 fast on the shaft 93, and at its rear end to an arm 96 of a freely swinging bell crank 97, which bell crank carries the tappet 89.

\Vhen the shutter 49 has been moved to obscure the window 51, and the guard bar 61 has been moved across the numeral keys, these devices may be moved back to their ineffective position by the actuation of the gei'leral operator. For this purpose the general operator as it comes forward, causes a bell crank arm 98 to ride out of a notch 99 in the extension of the rack 42, which forms part of the general operator.

As said arm 98 rises, the opposite arm 100 of said bell crank strikes a stud 101 fast on the bell crank 52, thereby swinging upwardly said stud (from the dotted to the the work-sheet.

full line position in Fig. 1) against the ten sion of the spring 50, thu drawing down the rock arm 51 past the point 60 of the latch 4:8, camming said latch back, and positively restoring the shutter 49 and the guard bar 61 to their normal ineffective positions. \Vhen the shutter and guard bar are thus restored, the latch 18 springs forwardly and holds them thus ineffective.

In the operations so far described, the er ror key might be actuated to restore the pins 19, which would thus move the guard bar and shutter 19 to their effective positions, and then the general operator might be actuated to move said shutter and guard bar back to their ineffective positions.

A device is, however, provided which will insure that before the general operator can thus be effective to move the guard bar and shutter, the letter E must be printed on To do this, the actuation of the error key is enabled to set a locking device which will prevent the latch i8 from being effective until the E key lever is depressed.

For this purpose, there is provided a locking pawl 102 pivoted on a bracket 112 near the front end of the error bar. When the error key is actuated, as seen in Fig. 2, the

.pawl 102 drops from the position seen in Fig. 1 to the position seen in Fig. 2. so that an abutment 103 on said pawl falls down behind a stud 10% on an eytension 105 of the rock arm 92. by which the error key operates said latch 48. \Vhen thus dropped down, said locking pawl 102 holds the latch 18 in its ineffective position, with the result that no matter how many times the general operator is actuated, said latch will fail to hold the guard bar 64 and the shutter 49 in their ineffective positions. This function of the locking pawl results from the fact that the shaft 93 controls the releaser bar 8% and so long as the locking pawl 102 causes the shaft 93 to hold said releaserbar in its rearward position, the latch 48 will be ineffective.

The locking pawl 102' is provided with connections which cause it to be automatically released if the E ke lever of the typewriter is depressed. T e connections for accomplishing this include a lever 106 pivoted between its ends and carrying at its forward end a stud 107 which underlies the locking pawl 102. When the E key of the typewriter is depressed, the lever 3 of said key strikes a stud 108 on an upstanding bar 109, which bar is pivoted to the rear end of the lever 106 with the result that whenever the E key is depressed, the front end of said lever 106 lifts the locking pawl 102 to carry its abutment 103 clear of the stud 104, thus permitting the spring 59 to draw the latch 48 forward] together with the releaser bar 84; said eleaser bar being now no longer held rearwardly by the abutment 103. Actuation of the general operator will then put the shutter and guard bar under the control of the latch 48.

The locking pawl 102 is provided with a spring 110 which normally presses the pawl downwardly, so that it will swing to effective position whenever the error key is operated rearwardly. The locking pawl is also provided with a projection 111 which prevents the extension 105 of the rock arm 92 from being swung too'far rearwardly. Said locking pawl is mounted on a bracket 112 near the front of the computing part of the combined machine at the bottom thereof, and the error key bar 66 includes an elbow portion 113, so that while the error key 67 is conveniently placed to be operated, I

the error key bar 66 lies practically at the bottom of the machine. Said error key can return unhindered by the locking pawl 102, because of the pin-and-slot connection at 90 and 91, by which said keyeperates the latch releaser bar 84.

Variations may be resorted to within the scope of the invention, and portions of the imm'ovements may be used without others.

Having thus described my jii'ivention, I claim:

1. In a combined typewriting and computing machine, the combination with numeral keys and other printing keys, of means normally tending to interfere with the operation of said numeral keys, a latch for holding said interfering means clear of the numeral keys, computation members on which the numerals written are temporarily set up, an error key for erasing the numerals so set up, means operated by said error key for releasing said latch, a device for restoring said latch, means for holding said latch ineffective and means controlled by one of said other printing keys for restoring said latchto effective condition.

2. In a combined typewriting and com puting machine, the combination with typewriting mechanism, of computing mechanism located beneath said typewriting mechanism, numeral type keys forming part of said typewriting mechanism, pendents con nected to said numeral keys and effective on the computing mechanism, alphabettype keys, and a pendent connected to an alphabet type key for cooperation with said computing mechanism to indicate upon the work-sheet a certain event in the operation of the computing mechanism.

3. In a combined typewriting and computing machine, the combination with. numeral keys and a traveling carriage, of a series of devices operated by said traveling carriage, computing mechanism comprising numbers set up by said numeral keys in a manner determined by some of said carriage-operated devices, means under the conthird key for interferin trol of another of said carriage-operated devices for interfering with the utility of the computing mechanism, a general operator effective to add the numbers set up by sald numeral keys and also effective to make said interfering device ineffective, and means under the control of an alphabet key of the typewriter for enabling said general operator to set said interfering device permanently in said ineffective position.

4. In a combined typewriting and computing machine, the combination with computing mechanism including a totalizer, of a shutter for said totalizer, means normally tending to make said shutter effective, a latch for holding said shutter ineffective, a device for operating said totalizer, an error key for the computing mechanism, means operated by said device for moving said shutter to ineffective position, so that said latch may hold it ineffective, means under the control of said error key for making said latch ineffective whether said device is actuated or not, and an alphabet key of the typewriter having means to make said error key controlled means ineffective.

5. In a combined typewriting and computing machine, the combination with type controlling numeral keys, of a special type controlling key, computing devices, a third key effective on said computing devices, means dependent upon the operation of the with the operation of said computing evices, and means for making said interfering means ineffective when said special type controlling keyis operated.

6. In a combined typewriting and computing machine, the combination with alphabet and numeral keys, of a typewriting mechanism, a computing mechanism, a device affecting the utility of said computing mechanism, and means under the control of a non-numeral key of the typewriting mechanism for controlling said affecting device.

7. In a combined typewriting and computing machine, the combination with numeral keys, computing wheels and a traveling carriage, of a shutter for said computing wheels under the control of said carriage, a spring normally tending to move said shutter to effective position, a latch for normally holding said shutter ineffective but released by said carriage, a device in which the numbers written are temporariiy registered, a general operator for carrying the numbers so registered into the con'lput-ing wheels, means operated by said general operator for putting said shutter under the control of said latch, an error key effective to make said latch ineffective, and a printing key to make ineffective the lastmained effect of said error key.

8. In a computing machine, the combinaeas es tion with a total register comprising digitbearing wheels and general operator, of an item, register in which digits may be temporarily set up, a shutter for said total register to obscure said wheels, an error key for erasing items from s id item register before they are carried into said total register, means operated by said error key whereby said shutter is moved to and mechanically held in effective position whenev r said error key is operated, means for restoring said. shutter to ineffective position, connections whereby a. non-compntii printing key must operate before said shutter can be so stored, trareling carri for selecting denominations in said ccm luting machine, a series of jacks, one for denomination, a special. jack to make said shutter cfli ective,

and means to enable said general operator to restore said shutter utter it is rendered ell ective. by said jack 17. In a computing machine, the combination with a general operator and a; total reg ister, of an item register in which digits may be temporarily set up, numeral keys for setting up digits in said item register, an error key for erasing items from said item register before they are carried into said total register, means for interfering with the operation of said numeral keys, means operated by said error key Win eby said interfering means becomes effective whenever said error key is operated, incineby said error key for maintaining the interfering means in effective position, manually controlled means for restoring said interference means to in effective position, a traveling carriage for selecting denominations in said computing machine, a series of acks, one for each denomination, a special iack to make said in terfering means effective, and means controlledby said. general operator for restoring said interfering means after being set by said jack.

18. In a computing machine, the combination with a general operator and a total reg ister, of an item register in which digits may be temporarily set up, numeral keys for set ting up digits in said item register, an error key for erasing items from said item register before they are carried into said total register, means for interfering with the operation of said numeral keys, means operated by I said error key whereby said interfering means becomes effective whenever said error key is operated, automatic means for detaining said interfering means in effective posi tion, means for Iestoring'said interfering means to inefi'cctive position, connections whereby a non-computing type key must be operated before said interfering means can be so restored, a. traveling carriage for select ing denominations in said computing rnachine, a series of jacks, one for each denomination, a special jack to make said interfering means effective, and means controlled by said general operator for restoring said interfering means after being set by said jack.

it In a combined typewriting and computing machine, the combination with alphabet type keys, numeral type keys and a traveling carriage, of computing devices, means whereby said numeral keys control said computing devices, special key, and means whereby said special key and an alphabet typo key may jointly controlthe efiectiveness of said computing devices.

20 lln a computing machine, the combination with an item register, of an error key to erase numbers set up in said item register, computing keys for so setting up numbers, non-computing keys, interfering devices for said computing machine, and means whereby said. error key makes said interfering devices ei'lectire and one of said non-computing keys determines whether they shall be made ineitective. a

21. in a combined typewriting and. computing machine, the combination with alpha-- bet and minimal keys, of devices in which numbers are temporarily set up by said keys, an error key, a device operated by said error key to erase numbers 111),; other devices controlled by said error key, and means whereby said error key is inetlf'ective to permit said other devices to be restored to normal position, but an alphabet key is eliTectire to permit them to be restored.

2T2, combined typewriting and computing machine having the usual computing devices, indexing devices settable to control the computing devices, printing devices, keys controlling the indexing devices and the printing devices, a general operator for operating the computing devices as controlled. by said indexing devices, and an error key for rendering the set-up ineffective before movement of the general operator, and corn prising a printing mechanism cooperatively related to the error key to be ellective before another setup, for printing a special charac on the workwheet to denotethat the number printed on the work-sheet has not been carried into the computing mechanism.

23. In a computing machine, the combination With devices in which numbers are temporarily set up, a register into Which the set up numbers are carried from said devices, and key operated means for printing automatically the items as they'are set up and for also printing the total after the same is obtained, of means for erasing the tem porarily set up numbers so that they will not be *arried into the register, a character printing device, and means under the joint control of said erasing means and said charactcr-printing device for constraining the operative to operate said charactenprinting device preparatory to further printing of items, or the total from the register.

2%. In a computing machine, the combination with computing mechanism including a shutter, of a latch normally holding said shutter open, an error key effective to release said latch to close said shutter, a printing key, and a second latch to hold said firstnamed latch ineffective, said second latch under the control of said printing key.

25. In a computing machine, the combination with a shutter, of a latch normally holding said shutter open, an error key efifective to release said latch to close said shutter, a printing key, a second latch to hold said first-named latch ineffective, said second latch under the control of said printing key, a device in which the numbers computed are temporarily registered, a totalizer on which said shutter is effective, a general operator for carrying numbers thus registered into said totalizer, and means operated by said general operator for putting said shutter under the control of said first-named latch.

26. In a combined typewriting and computing machine, the combination with typewriting mechanism and computing mechanism, of means settable to position to interfere with the operation of said computing mechanism, a printing key forming part of said typewriting mechanism effective to release said computing mechanism from such interference, and other keys forming part of said typeivriting mechanism effective as numeral keys on said computing mechanism.

27. In a combined typewriting and computing machine, the combination with alphabet and numeral keys, of computing devices, connections from said numeral keys to said computing devices for making them effective in one way, a special key, connections from said special key efi'ective in another way to make said computing devices inoperable, means set by said special key to maintain the computing devices in inoperable condition, and means controlled by an alphabet key for restoring the computing devices to operable condition.

FRED \VALSLEBEN.

Witnesses GRACE VALENTINE, LORENZ L. PRI'IZL. 

